Add toast for image fetch failures

2026-08-11 16:30:28 +00:00 · 2026-03-05 13:07:53 +01:00
parent 9709511e90
commit ab0c531a4b
4 changed files with 219 additions and 118 deletions
--- a/lib/utils/transmission_target_resolver.dart
+++ b/lib/utils/transmission_target_resolver.dart
@@ -0,0 +1,157 @@
+import 'dart:typed_data';
+
+import '../models/contact.dart';
+import '../providers/contacts_provider.dart';
+
+enum TransmissionTargetFailure { unknownContact, unknownRoute, tooFar }
+
+class TransmissionTargetResolution {
+  final Contact? target;
+  final TransmissionTargetFailure? failure;
+  final int maxHops;
+
+  const TransmissionTargetResolution({
+    required this.target,
+    required this.failure,
+    required this.maxHops,
+  });
+
+  int get hops => target?.outPathLen ?? -1;
+  bool get isValid => target != null && failure == null;
+}
+
+class TransmissionTargetResolver {
+  const TransmissionTargetResolver._();
+
+  static Contact? resolveLocalTarget({
+    required ContactsProvider contactsProvider,
+    required bool isSentByMe,
+    Uint8List? recipientPublicKey,
+    Uint8List? senderPublicKeyPrefix,
+    String? senderKey6FromEnvelope,
+    String? senderName,
+  }) {
+    if (isSentByMe) {
+      final recipient = _findByRecipientKey(contactsProvider, recipientPublicKey);
+      if (recipient != null) return recipient;
+    }
+
+    final byEnvelope = _findByEnvelopeKey6(contactsProvider, senderKey6FromEnvelope);
+    if (byEnvelope != null) return byEnvelope;
+
+    final byPrefix = _findByPrefix(contactsProvider, senderPublicKeyPrefix);
+    if (byPrefix != null) return byPrefix;
+
+    return _findByName(contactsProvider, senderName);
+  }
+
+  static Future<TransmissionTargetResolution> resolveFetchTarget({
+    required ContactsProvider contactsProvider,
+    required Future<void> Function() refreshContacts,
+    required bool isSentByMe,
+    Uint8List? recipientPublicKey,
+    Uint8List? senderPublicKeyPrefix,
+    String? senderKey6FromEnvelope,
+    String? senderName,
+    required int maxFetchHops,
+  }) async {
+    var target = resolveLocalTarget(
+      contactsProvider: contactsProvider,
+      isSentByMe: isSentByMe,
+      recipientPublicKey: recipientPublicKey,
+      senderPublicKeyPrefix: senderPublicKeyPrefix,
+      senderKey6FromEnvelope: senderKey6FromEnvelope,
+      senderName: senderName,
+    );
+
+    if (target == null || target.outPathLen < 0 || target.outPathLen > maxFetchHops) {
+      await refreshContacts();
+      target = resolveLocalTarget(
+        contactsProvider: contactsProvider,
+        isSentByMe: isSentByMe,
+        recipientPublicKey: recipientPublicKey,
+        senderPublicKeyPrefix: senderPublicKeyPrefix,
+        senderKey6FromEnvelope: senderKey6FromEnvelope,
+        senderName: senderName,
+      );
+    }
+
+    if (target == null) {
+      return TransmissionTargetResolution(
+        target: null,
+        failure: TransmissionTargetFailure.unknownContact,
+        maxHops: maxFetchHops,
+      );
+    }
+    if (target.outPathLen < 0) {
+      return TransmissionTargetResolution(
+        target: target,
+        failure: TransmissionTargetFailure.unknownRoute,
+        maxHops: maxFetchHops,
+      );
+    }
+    if (target.outPathLen > maxFetchHops) {
+      return TransmissionTargetResolution(
+        target: target,
+        failure: TransmissionTargetFailure.tooFar,
+        maxHops: maxFetchHops,
+      );
+    }
+    return TransmissionTargetResolution(
+      target: target,
+      failure: null,
+      maxHops: maxFetchHops,
+    );
+  }
+
+  static Contact? _findByRecipientKey(
+    ContactsProvider contactsProvider,
+    Uint8List? recipientKey,
+  ) {
+    if (recipientKey == null || recipientKey.isEmpty) return null;
+    final byKey = contactsProvider.findContactByKey(recipientKey);
+    if (byKey != null) return byKey;
+    if (recipientKey.length >= 6) {
+      return contactsProvider.findContactByPrefix(
+        Uint8List.fromList(recipientKey.sublist(0, 6)),
+      );
+    }
+    return null;
+  }
+
+  static Contact? _findByEnvelopeKey6(
+    ContactsProvider contactsProvider,
+    String? senderKey6FromEnvelope,
+  ) {
+    if (senderKey6FromEnvelope == null || senderKey6FromEnvelope.isEmpty) {
+      return null;
+    }
+    return contactsProvider.findContactByPrefixHex(senderKey6FromEnvelope);
+  }
+
+  static Contact? _findByPrefix(
+    ContactsProvider contactsProvider,
+    Uint8List? senderPublicKeyPrefix,
+  ) {
+    if (senderPublicKeyPrefix == null || senderPublicKeyPrefix.length < 6) {
+      return null;
+    }
+    return contactsProvider.findContactByPrefix(
+      Uint8List.fromList(senderPublicKeyPrefix.sublist(0, 6)),
+    );
+  }
+
+  static Contact? _findByName(
+    ContactsProvider contactsProvider,
+    String? senderName,
+  ) {
+    final normalized = senderName?.trim();
+    if (normalized == null || normalized.isEmpty) return null;
+    for (final contact in contactsProvider.contacts) {
+      if (contact.advName.trim().toLowerCase() == normalized.toLowerCase()) {
+        return contact;
+      }
+    }
+    return null;
+  }
+}